7th Class Science Sample Paper Science Sample Paper - 9

  • question_answer
    How does heat travel in air? Give any two such instances.

    Answer:

    The air near the heat source gets hot and rises. The cold air from sides takes its place. In this way air gets heated. This gives rise to interesting phenomena in coastal regions.                                                                           
    (i) During the day, land gets heated faster than water. The air over the land becomes hotter and rises up. The cooler air from sea rushes in towards the land to take its place. The warm air from land moves towards sea to complete the cycle. The air from sea is cool and is called sea breeze.                                                  
    (ii) At night, it is exactly the reverse. The water cools down more slowly than land. So, the cool air from land moves towards sea. This is called land breeze.


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